Which of these groups are NOT entitled to drive a commercial vehicle without a Federal medical examiner's certificate?

Cleaning up a spill, a huge contamination in particular, would be incredibly expensive. If you notice a leak, therefore, stop as soon as you possibly can and get off the road. Stay with your vehicle, due to liability and safety issues, and send someone else for help. As you must send a large amount of vital information--including where you are, your direction of travel, the hazard class and ID numbers, your carrier's location, the package's destination, and more--make sure you write it all down.